﻿MACROSEMIID^. 
  185 
  

  

  37099. 
  A 
  large 
  fish, 
  0-18 
  in 
  length, 
  with 
  imperfect 
  head 
  and 
  fins, 
  

   probably 
  of 
  this 
  species 
  ; 
  Solenhofen. 
  Haberlein 
  Coll. 
  

  

  P. 
  5547. 
  A 
  small 
  fish 
  ; 
  Eichstadt. 
  By 
  exchange, 
  1888. 
  

  

  Propterus 
  elongatus, 
  Wagner. 
  

  

  1863. 
  Propterus 
  elongatus, 
  A. 
  Wagner, 
  Abh. 
  k. 
  bay. 
  Akad. 
  W 
  7 
  iss., 
  

   math.-phys. 
  CI. 
  vol. 
  ix. 
  p. 
  645. 
  

  

  Type. 
  Fish, 
  wanting 
  squamation 
  ; 
  Palseontological 
  Museum, 
  

   Munich. 
  

  

  A 
  species 
  briefly 
  described 
  as 
  differing 
  only 
  from 
  P. 
  speciosus 
  in 
  

   the 
  more 
  slender 
  proportions 
  of 
  the 
  trunk, 
  which 
  tapers 
  more 
  

   rapidly 
  behind. 
  

  

  Form. 
  $ 
  Loc. 
  Lower 
  Kimmeridgian 
  (Lithographic 
  Stone) 
  : 
  Ba- 
  

   varia. 
  

  

  Not 
  represented 
  in 
  the 
  Collection. 
  

  

  Propterus 
  scacchii 
  (Costa). 
  

  

  [Plate 
  III. 
  fig. 
  6.] 
  

  

  1850. 
  Rhynchoncodes 
  scacchi, 
  0. 
  G. 
  Costa, 
  Atti. 
  Accad. 
  Pontan. 
  vol. 
  v. 
  

   p. 
  317, 
  pi. 
  v. 
  fig. 
  5. 
  

  

  Type. 
  Nearly 
  complete 
  fish 
  ; 
  University 
  Museum, 
  Naples. 
  

  

  The 
  type 
  species 
  of 
  the 
  so-called 
  genus 
  Rhynchoncodes, 
  of 
  small 
  

   size, 
  attaining 
  a 
  length 
  of 
  about 
  O06. 
  Length 
  of 
  head 
  with 
  

   opercular 
  apparatus 
  exceeding 
  the 
  maximum 
  depth 
  of 
  the 
  trunk 
  

   and 
  contained 
  about 
  three-and-a-half 
  times 
  in 
  the 
  total 
  length 
  of 
  

   the 
  fish 
  ; 
  the 
  dorsal 
  border 
  gently 
  arched 
  and 
  the 
  maximum 
  depth 
  

   of 
  the 
  trunk 
  about 
  three 
  times 
  as 
  great 
  as 
  the 
  width 
  of 
  the 
  caudal 
  

   pedicle. 
  Length 
  of 
  the 
  first 
  dorsal 
  fin-ray 
  nearly 
  equalling 
  the 
  

   depth 
  of 
  the 
  trunk 
  at 
  its 
  point 
  of 
  insertion. 
  

  

  Form. 
  6f 
  Loc. 
  Upper 
  Jurassic 
  : 
  Naples. 
  

  

  P. 
  3613. 
  Specimen 
  0*055 
  in 
  length, 
  displaying 
  the 
  general 
  form 
  of 
  

   the 
  fish 
  but 
  much 
  abraded, 
  shown 
  of 
  the 
  natural 
  size 
  in 
  

   PI. 
  III. 
  fig. 
  6 
  ; 
  Torre 
  d'Orlando, 
  near 
  Castellamare, 
  

   Naples. 
  Each 
  part 
  of 
  the 
  dorsal 
  fin 
  seems 
  to 
  have 
  com- 
  

   prised 
  about 
  10 
  rays, 
  and 
  the 
  anal 
  fin, 
  with 
  only 
  6 
  rays, 
  

   exhibits 
  large 
  fulcra 
  along 
  its 
  anterior 
  border 
  resembling 
  

   those 
  of 
  the 
  caudal 
  fin. 
  Enniskillen 
  Coll. 
  

  

  To 
  the 
  genus 
  Propterus, 
  perhaps 
  also 
  to 
  the 
  species 
  P. 
  scacchii, 
  

   may 
  be 
  referred 
  two 
  small 
  imperfect 
  fishes 
  from 
  the 
  Upper 
  Jurassic 
  

   of 
  Torre 
  d'Orlando 
  (errore 
  " 
  Pietraroja 
  ") 
  described 
  under 
  the 
  name 
  

  

  